After updating to Pixelmator Pro 1.6.1 (or even the update to 1.6) saving my Pixelmator-files is no longer non-destructive. After re-opening the saved file, I cannot edit specific layers, because they are all merged together.
I checked the settings already. They are set to non-destructive saving. (I tried both sub-options: save in iCloud and save in pic).
I am using macos catalina 10.15.4